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We present a new, time dependent, three-dimensional code for modelling the inner regions of X-ray binaries and AGN, where the photon distribution emitted by the accretion disc evolves simultaneously with the interacting electron distribution. The HEART (High Energy Astrophysical Radiative Transfer) code can model many different geometries including a spherical corona and an inhomogeneous corona. Inverse Compton scattering, bremsstrahlung, synchrotron radiation, Coulomb interactions, reprocessing of photons by the accretion disk, electron-positron annihilation and pair production are modelled. Electron distributions may be of power law form, thermal or a combination. We include some fits to X-ray spectral data and some results already obtained using the code.

The HEART (High Energy Astrophysical Radiative Transfer) code: modelling X-ray binaries and AGN